The evidence supports a capability map, not a standalone demo-content labour-market forecast. Public sources reveal relevant responsibilities and a few compensation disclosures. They do not establish the number of paying US-facing demo publishers, their procurement budgets, the share of staff time devoted to demos or their willingness to buy independent research.
The practical conclusion is to use hiring signals as the start of investigation. Product and content roles help locate priorities; release, data and engineering roles expose operating responsibilities. The purchase decision should still turn on documented rights, relevant catalogue coverage, tested availability and an explicit owner for ongoing work.